The May 28 Transaction Was Cancelled
The surviving Detroit and Phoenix transaction ledgers resolve the central issue: the reported May 28, 1975 Earl Williams-for-Willie Norwood exchange did not become a completed NBA trade. Basketball-Reference's 1975-76 Detroit page says Williams was originally traded for Norwood on May 28 but that the trade was cancelled, and the Phoenix page records the same cancellation. The proposed conditional 1976 pick therefore belongs to the cancelled package, not to a completed transaction.
Neither Player Changed Teams Through This Record
Because the May deal was cancelled, Earl Williams did not become a Piston through this transaction and Willie Norwood did not become a Sun through it. Norwood remained under Detroit control and was waived in October. Any retrospective that assigns Williams' later Detroit games or Norwood's later career to the May proposal creates a false value chain. This record is useful as transaction provenance, but it cannot support a winner or team grades.
Detroit Acquired Williams in a Separate September Trade
Detroit eventually did acquire Earl Williams, but on September 30, 1975 in a different completed deal. The Pistons sent Phoenix a 1976 second-round pick that became Earl Tatum. Both team transaction pages and the league-wide 1975-76 ledger distinguish that September trade from the cancelled May proposal. Williams' later Detroit production belongs to the September transaction and must not be backfilled into this record.
The Correct Archive Treatment Is Supersession
The legacy May entry is retained only so the source history is not erased. Its listed player and conditional-pick terms describe a proposal that was later voided, while the completed September exchange has different consideration. Treating the May record as an ordinary graded trade would duplicate Williams' move and award value to assets that never legally changed teams. The defensible treatment is structural supersession: private, noindex, no ads, no winner and no grades.
Final Resolution
Record Superseded — cancelled transaction, no winner and no team grades. Detroit and Phoenix did not complete the May 28, 1975 Earl Williams-for-Willie Norwood proposal. Williams reached Detroit only through the separate September 30 trade for a 1976 second-round pick that became Earl Tatum. The May record remains in the archive for provenance, but it is excluded from graded and index-candidate results.